反应详情

A solution of iodine (9.86 g; 38.84 mmol) and potassium iodide (6.45 g; 38.84 mmol) in water was added dropwise to a suspension of 3-chloro-4-methylaniline (5.00 g; 35.31 g) in a solution of sodium bicarbonate (4.75 g; 56.50 mmol). The resulting mixture was stirred 72 hours at room temperature filtrated and the solid dissolved in dichloromethane, washed with a saturated solution of sodium thiosulphate, dried over magnesium sulphate and concentrated under reduced pressure. The crude residue was purified by flash chromatography on silica gel (eluent 2 to 20% ethyl acetate in heptane) to yield 2.30 g (24%) of 5-chloro-2-iodo-4-methylaniline as a brown solid.

1. filtrationfiltrated
2. dissolutionthe solid dissolved in dichloromethane
3. washwashed with a saturated solution of sodium thiosulphate
4. dry with materialdried over magnesium sulphate
5. concentrationconcentrated under reduced pressure
6. customThe crude residue was purified by flash chromatography on silica gel (eluent 2 to 20% ethyl acetate in heptane)